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Posted to issues@spark.apache.org by "Thomas Graves (Jira)" <ji...@apache.org> on 2020/02/11 19:22:00 UTC
[jira] [Commented] (SPARK-28845) Enable
spark.sql.execution.sortBeforeRepartition only for retried stages
[ https://issues.apache.org/jira/browse/SPARK-28845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17034755#comment-17034755 ]
Thomas Graves commented on SPARK-28845:
---------------------------------------
[~cloud_fan] [~XuanYuan] I wanted to followup on this with regards to [https://github.com/apache/spark/pull/25491]
It looks like this got closed because its to difficult, but with SPARK-25341 - do we need the sort at all? I didn't think we did and if we do I would like to understand. So then I assume it comes down to performance.
> Enable spark.sql.execution.sortBeforeRepartition only for retried stages
> ------------------------------------------------------------------------
>
> Key: SPARK-28845
> URL: https://issues.apache.org/jira/browse/SPARK-28845
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core, SQL
> Affects Versions: 3.0.0
> Reporter: Yuanjian Li
> Priority: Major
>
> For fixing the correctness bug of SPARK-28699, we disable radix sort for the scenario of repartition in Spark SQL. This will cause a performance regression.
> So for limiting the performance overhead, we'll do the optimizing work by only enable sort for the repartition operation while stage retries happening. This work depends on SPARK-25341.
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